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Thread: Steering Box Adjusting Bolt Lock Nut

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    Luke Skywalker
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    Steering Box Adjusting Bolt Lock Nut

    I am working on a BJ8 and the locking nut is toast. It has been ground off half way by someone. Does anyone know the thread on adjusting bolt for the steering box?

    thank you
    Last edited by Editor_Reid; 09-30-2020 at 10:14 PM.

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    Jedi Warrior
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    Re: thread on the lock nut for the adjusting bolt on Steering box?

    I believe the steering box adjustment peg is secured with a jam nut which is typically lower in profile and about half the size of a conventional nut of same threading. Yours just might be correct. Is the nut ruined or damaged in any way so that it's not locking the peg properly? Gonzo

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    Luke Skywalker
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    Re: thread on the lock nut for the adjusting bolt on Steering box?

    It is damaged enough that you would not be able to get it loose once the car is together. And yes it is the half profile nut I am asking about.

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    Re: thread on the lock nut for the adjusting bolt on Steering box?

    Understood. Not knowing thread size, suggest you pull the peg and take it to local hardware store for a correct size jam nut - alternatively purchase from your favorite supplier. Good luck.

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    Re: thread on the lock nut for the adjusting bolt on Steering box?

    Jerry,

    Guessing here as I don't have my car right now... nut and screw are "NA" in Moss catalog. I'm guessing they're an obsolete whitworth pattern. AH spares sells the screw for a hefty price - but not the nut.

    Suggest buying used from British Car Specialists - David Nock handles the used stuff.

    PS - if you can measure the thread count and diameter, you could look up the spec on one of the British fastener charts online and maybe get a nut from:
    https://britishfasteners.com/
    Steve Gerow
    Altadena, CA, USA
    1959 AH BN6 2-seat roadster / 1974 TR6 Emerald Green
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    Re: thread on the lock nut for the adjusting bolt on Steering box?

    Jerry, I sent you a PM. Call me
    Richard Mayor
    Vintage Racer HBN7L-466
    Portland, Oregon

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    Re: Steering Box Adjusting Bolt Lock Nut

    Jerry, if you haven't located one, I probably have one but will have to do a little digging tomorrow to confirm.

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    Luke Skywalker
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    Re: Steering Box Adjusting Bolt Lock Nut

    If you think it is whitworth threads, I have a kit of tap and dies for that. I will check to see if I have anything that large. The nut at present is on the peg and stuck. I think it will break before it will unscrew.

    Richard, I will call this morning to get your advice.

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    Luke Skywalker
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    Re: Steering Box Adjusting Bolt Lock Nut

    Richard thinks the tpi is close to 20tpi. I checked my dies. BSF, BSW, Metric and nothing matches. It is very close to 1/4 pipe thread. Also to m14 x 2.0. . But none of those are close enough that they would not ruin the peg.
    Jerry

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    Re: Steering Box Adjusting Bolt Lock Nut

    Jerry, quite unlikely that it is Whitworth or metric. I'm heading down to check my spares stash shortly. Can I assume that due to the nut problem the adjusting screw is stuck in the steering box cover?

    EDIT: just checked and I have a couple pegs and nuts. Major diameter of peg is approx .510" and has between 18.5 and 19 tpi. This seems to indicate it is 1/4" BSP. Rather odd for the usage.
    EDIT2: little further digging and it may be an obsolete M13 thread.

    Jerry, I pm'd you my phone number. I can get whatever you need into the mail today or tomorrow.

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    Jedi Warrior red57's Avatar
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    Re: Steering Box Adjusting Bolt Lock Nut

    I have no idea what thread it is.

    the flats (wrench size) measure 18mm across, the threaded stud measures about .510/13mm,
    I have no thread gauge that matches... it's somewhere between 18 and 20 tpi and none of my metric thread gauges seem to match.

    I do have one though, along with the stud - last summer I bought a couple of steering boxes on eBay trying to find a rebuildable one - no joy, but it has left me with some spare parts

    The only way I have to ship it is priority mail because I happen to have a box here and some stamps (I won't go near a post office because of the virus).
    Down side is USPS website says $8:30 for postage - if you want to pay the postage, it's yours. Just PM me a mailing address.
    IMG_3894.jpg

    Dave

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    Luke Skywalker
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    Re: Steering Box Adjusting Bolt Lock Nut

    thanks Dave, the previous lister Craig is sending me a nut. He only lives a few hours away! Great Forum.

    Jerry

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